Malicious PDF — malware analysis report

Static analysis result for SHA-256 296317391f773e16…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 12:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4b2c00b05641053e56a114d7a6fef834 SHA-1: 4dbccd37805d4c66cc5e5fce6c412f1350c58717 SHA-256: 296317391f773e1681cde93acfd829f51cb536b39cc74c8b1f332878137b9d28
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of numerous external links, many pointing to unknown domains and some associated with link farms, suggests a phishing or credential harvesting attempt. The 'Urgency / deadline lure' heuristic further supports a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/81241479057.pdf In PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/fezaviletujeb.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/0hkkke60n6t4davsk3meuf1ej7/pelerugal.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/waxeruwetitekififeramu.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/xulezofi.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/18232386039.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/47201800253.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/biluzabepozol.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/bokasomomi.pdfIn PDF document text
    • http://nova-auto.com/upload/serabexe.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/56283928782.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/ratujuwiniwuwonigi.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/bulaperawebuwut.pdfIn PDF document text
    • http://surtek.biz/image/files/20150320_124340.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/xinovisemoxazovo.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/7b46f1c9785400b937bc1a2f6613aed7/99417392836.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/jukipizivexowupese.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/19612509949.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nonitesofasepo.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/betodinesasegad.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/ribadag.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210901172756.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/xugokuxamewitawenukitovux.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/76906524564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tetris+online+free+gamePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D0 17800 bytes
SHA-256: 414494533637461e725f32ff2f0e51f7d45901bee012c4cbff55d7a3367b1e9a
font_01_sfnt_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 10520 bytes
SHA-256: 0710322bc8316f8d287319fe9f1e9fa8860a69b0bedf302b6cd562d48368b003
font_02_sfnt_off00011f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1